Why should you buy an Energizer lithium ion jump starter. Safety is our number one concern; Unmatched performance, Our jump starters ability to start a vehicle will outperform any other jump starter with the same battery size. The ENX8K includes smart cables, these smart cables are critical for the safety of the jump starter and your car battery, the protections include; Reverse charge protection, reverse polarity protection, low voltage protection, over current protection, over temperature protection and short circuit protection.